Nw Capabilities Highlights


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Nw Capabilities Highlights

  1. 1. Capabilities Highlights Nelson Wallace B.S. Physics, Georgia Tech M.S. Optics, University of Rochester • Optical Systems Engineering • Systems Performance Management • Optical Systems Performance Prediction • Modeling, Analysis, & Simulations • Detailed Optical Engineering • Design, Analysis, Tolerancing, Assembly, & Alignment • Management • Project and Line Leadership Page 1 of 5 nwwallace@roadrunner.com 4/7/2009
  2. 2. Optical Systems Engineering Systems Performance Management • Top-level performance requirements development and allocation or translation into subsystem requirements and designs • Validation and optimization of system performance through top-down and bottom- up requirements and performance analyses • Key front-end trade-offs, prioritization of optical system requirements, and development of solutions or technical alternatives in order to reduce program risks • Identification of system cost drivers and suggestions for alternatives • Specification creation, cost estimate, technology readiness assessment, vendor evaluations, source selection, engineering for fabrication, subassembly integration, testing, and troubleshooting • Verification methodologies Page 2 of 5 4/7/2009
  3. 3. Optical Systems Performance Prediction Modeling, Analysis, & Simulations • Creation of computer models to predict and optimize overall instrument performance against mission requirements, such as • signal-to-noise ratio • system and optics modulation transfer function • classification accuracy • ground resolved distance • radiometric accuracy • sub-pixel centroid tracker accuracy • special instrument-specific performance measures in MathCad • polarization accuracy • star tracker availability • custom models as needed • Proficient with atmospheric transmission and radiance codes (MODTRAN, etc.) • Control of off-nominal conditions such as degradations from jitter, optics aberrations, detector noise and cross-talk, electronics noise, stray light, absorption and multiple scattering effects from long atmospheric paths or murky water, Fresnel diffraction, tolerances of manufacturing, assembly, alignment, and environmental effects. Page 3 of 5 4/7/2009
  4. 4. Detailed Optical Engineering Design, Analysis, Tolerancing, Assembly, & Alignment • Proficient with current optical design, analysis, and stray light software; specifically, Code V, OSLO, ZEMAX, Accos V, HEXAGON, MACOS, Mini-APART, ASAP, SOAR, Guerap V, FRED, Light Tools and TracePro, LOTS & GLAD propagation codes, and TFCalc thin film code. • Determined pointing error sensitivities for lasercomm cross link optics. • Produced error budgets for clear aperture, pointing, and wavefront error for National Ignition Facility laser, including thermally and mechanically induced errors. • Produced original optical designs for an extremely wide field-of-view surveillance lens required to have an external, forward stop. • Designed a refractor well corrected for color over a very wide spectral range using glass choices insensitive to darkening from space radiation. • Performed iterated tolerancing for the reflective optics of a solar telescope. • Used Guerap V to determine the susceptibility of an optical sensor to stray light effects from laser jamming. • In Code V, wrote custom performance evaluation macros to control the cross-track spectral and spatial co-registration errors of an imaging spectrometer during optimization, and during user-defined tolerancing. Created user-defined surfaces for evaluation of performance degradations from thermally induced refractive index gradient profiles in an infrared sensor. • Design, tolerancing, specification, procurement, inspection, and hands-on optical assembly and alignment of NASA's Glory APS optical trains. Page 4 of 5 4/7/2009
  5. 5. Management Project and Line Leadership • Technical proposal design, coordination, and management • Optical systems engineering projects management from pre-proposal through design and development to production, testing, and operation. • As functional manager and as project manager, directed technical people in hardware and simulation projects. • Interfaced directly with customers and their technical consultants. • Fifteen years line management experience. • Twelve years project management experience • Communication and interpersonal skills. Page 5 of 5 4/7/2009